Monitoring Invertebrate features on Sites of Special Scientific Interest (SSSIs): assessing and reviewing the status of the troglobitic spider Porrhomma rosenhaueri in Ogof y Ci and Lesser Garth Cave, South Wales in 2017

Porrhomma rosenhaueri is a rare cave-dwelling spider with a highly restricted distribution in the UK, known only from Ogof y Ci near Merthyr Tydfil and Lesser Garth Cave near Cardiff. This survey was undertaken to determine whether the species remained present in the Ogof y Ci cave system and to assess the feasibility of establishing a Common Standards Monitoring (CSM) protocol for long-term population monitoring. The survey also revisited the existing CSM monitoring programme for Lesser Garth Cave to assess the condition of the spider population and the ecological condition of the cave habitat. Surveys undertaken in 2017 confirmed the continued presence of Porrhomma rosenhaueri at both sites, including the first record from Ogof y Ci since 1971. Results indicate that both cave systems support important cave invertebrate assemblages and remain significant sites for the conservation of this species.

Identification

Identifier
NRW_DS121120
Alternative Title
Metadata Language
English
Lineage

Survey data were collected through visual searches of suitable cave habitats. Two site visits were undertaken during September and October 2017 to survey Ogof y Ci and other accessible sites within the Nant Glais Caves SSSI for Porrhomma rosenhaueri and associated cave fauna. The species was recorded within the Ogof y Ci cave system, providing the first confirmed record since 1971 and enabling the development of recommendations for future monitoring. In October 2017, the established Common Standards Monitoring (CSM) protocol for Lesser Garth Cave was repeated to assess the status and distribution of the spider population within the cave. Records of spiders, webs and habitat condition were collected and compared with previous surveys to evaluate population status and support ongoing conservation monitoring.
Dataset Reference Date (Publication)
2018-01-01

Temporal Extent

Begin date
2017-09-09
End date
2017-10-31
 
Topic category
  • Biota
Owner
  Natural Resources Wales (NRW) -
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
Originator
  National Museums and Galleries of Wales -
Education Department, Cathays Park, Cardiff, Vale of Glamorgan, CF1 3NP
http://www.museumwales.ac.uk/
 

Extent

Extent

Geographic Extent
Wales (WLS)
N
W
E
S
Map representing the geographic extent of the dataset


 
 

Distribution

Distribution

Format Type and Description
  • Database ( Unknown )

    Specification

    Species records: Recorder 6

  • Documents ( Unknown )

    Specification

    Report in pdf format

 

Quality

Data quality

Quality Scope
Dataset
Conformity
Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services
Explanation

This dataset has not been assessed for conformance to the referenced INSPIRE regulation.
Degree
false
Lineage

Survey data were collected through visual searches of suitable cave habitats. Two site visits were undertaken during September and October 2017 to survey Ogof y Ci and other accessible sites within the Nant Glais Caves SSSI for Porrhomma rosenhaueri and associated cave fauna. The species was recorded within the Ogof y Ci cave system, providing the first confirmed record since 1971 and enabling the development of recommendations for future monitoring. In October 2017, the established Common Standards Monitoring (CSM) protocol for Lesser Garth Cave was repeated to assess the status and distribution of the spider population within the cave. Records of spiders, webs and habitat condition were collected and compared with previous surveys to evaluate population status and support ongoing conservation monitoring.
 

Keywords

Keywords

GEMET - INSPIRE themes, version 1.0
Type
Theme

Citation

Date (Publication)
2008-06-01
Code
geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme

Keywords

NRW Thesaurus
  • biological monitoring
  • cave spider
  • biological surveys
  • ecological surveys
  • porrhomma rosenhaueri
  • caves
  • invertebrate surveys
Type
Theme

Citation

Date (Publication)
2026-08-27
Code
geonetwork.thesaurus.local.theme.converted_nrw-keywords
 

Spatial Reference System

Code
British National Grid (EPSG::27700)
 

Content

Content Information

NRW Profile

Custom Elements

NRW Related Title

Monitoring Invertebrate features on SSSIs: assessing and reviewing the status of the troglobitic spider Porrhomma rosenhaueri in Ogof y Ci and Lesser Garth Cave, South Wales in 2017
 

Constraints

Constraints

Limitations on Public Access and Use

Restriction type
Other restrictions
 

Access Constraints Directive

Limitations
no limitations
 

Access Constraints Text

Other constraints

There are no access restrictions on this data. NRW may release, publish or disseminate it freely.
 

Use Constraints

Use constraints type
Other restrictions
Other constraints

© CNC/NRW Data may be re-used under the terms of the Open Government Licence providing it is done so, acknowledging both the source and NRW's copyright. It is the recipient's responsibility to ensure the data is fit for the intended purpose.
 

Attribution Statement

Other constraints

Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved.
 

Licence

Other constraints
Open Government Licence
 
 
 

Metadata

Metadata

File Identifier
4f4c4942-4343-5764-6473-313231313230 XML
Metadata Language
English
Parent Identifier
Welsh Invertebrate Database (WID)

NRW_DS23774
Resource type
Dataset
Metadata Date
2026-09-29T15:04:52.002Z
Metadata Standard Name
NRW
Metadata Standard Version

1.0

pointOfContact
  Natural Resources Wales (NRW) -
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
 
 

Publishing Body

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